[arch-security] [ASA-201511-6] powerdns: denial of service

[Levente Polyak]

Arch Linux Security Advisory ASA-201511-6
=========================================

Severity: Medium
Date    : 2015-11-12
CVE-ID  : CVE-2015-5311
Package : powerdns
Type    : denial of service
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE

Summary
=======

The package powerdns before version 3.4.7-1 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 3.4.7-1.

# pacman -Syu "powerdns>=3.4.7-1"

The problems have been fixed upstream in version 3.4.7.

Workaround
==========

When the PowerDNS Authoritative Server is run inside the guardian
(--guardian), or inside a supervisor like supervisord or systemd, it
will be automatically restarted, limiting the impact to a somewhat
degraded service.

Description
===========

This bug was found using afl-fuzz in the packet parsing code. This bug,
when exploited, causes an assertion error and consequent termination of
the the pdns_server process, causing a denial-of-service.

Impact
======

A remote attacker is able to send specially crafted query packets to
crash the powerdns server process, causing a denial-of-service.

References
==========

https://access.redhat.com/security/cve/CVE-2015-5311
https://doc.powerdns.com/md/security/powerdns-advisory-2015-03/
https://bugs.archlinux.org/task/47014

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